We use available ultraviolet imagery and HIRES processing of IRAS data
to examine the energy balance in spatially-resolved spiral galaxies,
using the UV data to constrain the dominant energy input to the dust
more tightly than possible from optical data.
The improved resolution of the HIRES output allows separation of
individual clumps of star-forming regions in the disks
of nearby galaxy, so that we can start to approach a point-by-point
comparison of stellar energy input and FIR reradiation. The
availability of UV fluxes for many of these clumps allows us
to map the input UV radiation field more accurately than
is possible either from optical colors or use of H$\alpha$
emission (which is insensitive to stars later than about B0).

For the disks of Sc galaxies, we find (in agreement with earlier
work) that young hot stars dominate the dust heating. In the central
parts of the Sb galaxy M81, additional heating (presumably from
the more intense optical starlight, since the AGN is very weak)
is necessary, much as found for several other early-type galaxies
from KAO observations.